Saving "All events" from the editor opened on one occurrence wrote that
occurrence's data to the whole series. Renaming a weekly series from its
third occurrence moved the series' start to that day: the first two
occurrences were gone, a counted series ran two weeks longer, and
overrides before the new start were orphaned. The occurrence's
participants went to every occurrence as well, so an attendee who had
declined only that day now declined the series, and Stalwart sent them
no more updates (live on 1.0 and 0.16.23). The check for a move
compared the form with the occurrence, so the rename that moved the
series did not ask anyone again.
The series now keeps its own:
- when it happens, unless the occurrence was moved; then the series
moves by as much, from its own start and in its own time zone, and
the length changes only when the editor changed it
- its participants and their answers, with the attendees the user added
or removed in the editor; when the series moves, its organizer asks
the attendees again
The scope handling moved from calendar-app.tsx to
`lib/recurrence-scope-edit.ts` so it can be tested. The editor now hands
its attendees (as opened and as saved) and its dates to the save.
Linus Rath
e8ba9e3569